<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>圆角问题</title>
		<style>
			
			.box{
				height: 200px;
				width: 200px;
				background-color: rgba(255, 0, 0, 0.4);
				
			}
			
			
			.box1{
				
				width: 50px;
				height: 100px;
				background-color: #f00;
				/* border-radius: 10px; */
				position: absolute;
				left: 100px;
				/* transform: rotateZ(-45deg); */
			}
			.box2{
				width: 50px;
				height: 100px;
				background-color: red;
				position: absolute;
				top: 0px;
				left: 100px;
				transform: rotateZ(45deg);
			}
			
			
			
			
			
		</style>
		
		
		
	</head>
	<body>
		<div class="box">
			<div class="box1">1</div>
			<div class="box2">2</div>			
			<div class="box3"></div>
			<div class="box4"></div>
			<div class="box5"></div>
		</div>

		
		
		
	</body>
</html>